What should I do if my dog’s ringworm keeps spreading?
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Overview
If your dog’s ringworm seems to be spreading, it’s worth taking it seriously and tightening up hygiene at home. Ringworm can spread within the coat, to other pets, and sometimes to people, but there can also be other reasons patches look worse or keep appearing, so it’s best not to assume the cause from appearance alone.
Things To Check
1. Check whether new patches are appearing in places your dog scratches, rubs or licks most often.
2. Look for round areas of hair loss, broken hairs, flaky skin, redness or crusting.
3. Think about whether grooming tools, bedding, blankets or collars are being shared between pets.
4. Check if the skin is getting more irritated after washing, brushing or clipping.
5. Look at any other pets or people in the home for similar skin changes, especially itchy or ring-shaped patches.
6. Note whether the area is moist, scabby, smelly or sore, which can point to a secondary skin issue as well.
7. Consider whether your dog has been in contact with another animal, a new environment or contaminated surfaces recently.
Common Causes
The most common reason is that the infection is still active and spreading through contact with the coat, bedding or the environment. Re-infection can also happen if contaminated items are not being cleaned often enough.
Sometimes a different skin problem can look similar to ringworm, or ringworm may be present alongside another issue such as sore skin, scratching or a secondary infection.
Less commonly, an underlying health issue may make skin infections harder to clear, especially if your dog’s skin problems keep returning or seem unusually widespread.
What To Do
Try to keep your dog’s routine as simple and consistent as possible. Wash hands after handling affected areas, and if you can, limit close contact between your dog and other pets until you’ve spoken to a vet.
Wash bedding, soft toys and any fabric that your dog lies on regularly, following the care instructions. Clean grooming tools, collars and brushes thoroughly, and avoid sharing them between animals.
Try not to clip, brush or wash the affected areas more than needed, because extra handling can sometimes spread flakes and broken hairs. If you do need to groom, use clean equipment and dispose of loose hair carefully.
Keep an eye on whether the patches are getting larger, whether new areas are appearing, or whether anyone else in the household develops similar skin changes.
When To Contact A Vet
If the patches keep spreading, if your dog seems uncomfortable, or if the skin is becoming sore, crusted or infected-looking, it’s sensible to speak to your vet. Ringworm can be mistaken for other skin problems, and your vet can help confirm what’s going on and advise on the right management.
You should also get advice sooner if anyone in the household develops a suspicious skin rash, or if there are young, elderly or immunocompromised people in contact with your dog.
Products That May Help
When you’re managing a skin issue at home, gentle cleaning and good grooming habits can be useful as part of your routine. The arlo.® Pet Care collection may help support that day-to-day care.
Related Questions
How long does ringworm take to clear in dogs?
Can ringworm spread from my dog to people or other pets?
What should I clean in the house if my dog has ringworm?
Atlas is here to support owners with practical, easy-to-understand guidance. It is not a substitute for professional veterinary advice. If you're concerned about your animal's health, symptoms worsen, or something doesn't feel right, contact your vet.